No.20 rubber main company is a futures product launched by Shanghai International Energy Exchange Center, and the continuous futures price of natural rubber No.20 standard contract. Standardized contracts for futures market transactions. The trading unit of No.20 natural rubber futures contract is 5 tons/lot, and the quotation unit is RMB/ton. The lowest fluctuation price is 5 yuan/ton, and the daily maximum price fluctuation is limited to no more than 3% of the settlement price of the previous trading day.